Mining-machine truck



Se t.

p 1927 c. B. OFFICER MINING MACHINE. TRUCK Original Filed Nov. 3, 1917III Patented Sept. 6, 1927.

mamas earns :oFF icE."

CHARLES B. OFFICER, F WINNETKA, ILLINOIS, ASSIGNOR TO SULLIVAN MACHINERYCOMPANY, ACORPOBATION 0F IKASSAGHUSETTS.

Mmmeavracnrnn TRUCK.

Application filed November a, 1917, Serial No. zcaoso. Renewed May a1,1927.

In the accompanying drawings, I have shown for purposes of illustrationtwo embodiments which my invention may assume in practice.

In these dr awings,

Fig. 1 is a plan view of a truck equipped with my improvement.

Fig. 2 is a side elevation, partially in section, of the truck inloading 'or unloading position, a mining machine being shown in aplurality of positions thereon.

Fig. 8 is a side elevation, partially in section, of the truck intransport position, a mining machine also being shown in a plurality ofpositions thereon.

Fig. 4 is a side elevation, partially in :section, of a modified form ofthe construction shown in Figs. 1 to 3. v 1

In, this illustrative construction, I have 1 disclosed a truckcomprising a rigid machine supporting and guiding frame 1 mounted uponwheels 2'and 3, respectively carried upon rear and front axles 1 and 5,and adapt ed to move upon the usual track 6, the front end of the framebeing transversely connected by the axles and ext-ending only to a pointadjacent the front' axle. As in the usual construction, this frame ispropelled through suitable truck driving'mechanism 7 disposed at therear endof the same and provided with a suitable rotatable element 8adapted to be engaged by a rotating part 9,

'of a mining machine 10 and to impart its rotation through suitabledriving mechanism including a chain andsprocket connection 11 to therear axle 4:, the latter being connected through a similar chain andsprocket connection 12 to the front axle 5. As usual in such machines, aflexible element,

' or feedmember, such as the'chain 13, is

adapted to be connected to a suitable feed member abutment, as forinstance a chain fork 14, at the'rear of the truck frame 1, during theloading operation, the machine being fed along this chain into itsloaded po- 811310114 i In my improvement, it will be noted that I haveprovided upon the frame 1 a cooperatlngor supplemental guiding member orelement 15 preferably comprising a fiatbot-tom and upstandingsideflanges and adapted to guide the machine in its movement toward or fromthe truck and to be compactly disposed in loaded position in'a planebeneath the tops of the truck wheels and adjacent the truck axles, andthere to underlie the machine in the loaded position of the latter 1upon the frame 1. As shown, this element 15 comprises suitablelongitudinally disposed angle iron elements suitably connectedtransversely by cross-members 16 disposed at its rear end and slightlyin rear of its middle, and suitably braced at points intermediate theirends and adjacent their front end by crossing diagonals 17 disposedbetween the middle cross member 16 and a flared, transversely disposedfront machine receiving member 18. It'will thus be observed that a veryrigid construction is produced having an opening between the front andrear members 16. At a point at its rear end, this member 15 is alsoprovided with a stop 19 adapted to engage with the front end of a shoe20 on the mining machine, as hereinafter more fully brought out.Attention is also directed to the fact that at a point substantiallymidway between its ends, herein slightly in rear of a point midwaybetween its ends, and in front of the stop 19, this element 15 isprovided with means whereon the element may be tilted vertically, hereincomprising a centrally located depending portion 21 reciprocabletherewith between the axles 4 and 5 and provided with a suitable journalsur- I Itwill also be observed that m position which the same wouldoccupy during transport. When it is desired to unload the machine, aswhen the truck has been propelled into a room and adjacent thetrackendand the mine face, it is only necessary to connect the chain 13of the machine to a point adjacent the face in order that the machinemay be propelled under its own power along this chain and relative tothe truck and toward the face. As the machine moves to the right fromthe position'fhown in Fig 3, it will obviously, due to its weight, carrywithit the eiement 15,"causing the portion 21 thereot to be reciprocatedbetween the axles 4 and 5. As, however, the machine moves 7 furthervtorward and its center of gravity passes out beyond the, front of thetruck, the depending portion 21 on the, element 15 will comeintoengagement with the front axle so tl at as the weight of the machinetends to move downward, the journal 22 on this member 21 may move aboutthe front axle as a pivot, and, unless the element has already tiltedunder the weight of the machine, thus enable that element to swing abouta pivot in rear of its middle and assume the position shown in Fig. 2,wherein it is disposed at an angle relative to and supported at' a'point intermediate its ends on the'tinok'irame '1, herein at a pointsubstantially mid way between its ends, with its rear end in the, airand its i'ront' end in engagement with' the bottom, in such a man'- neras to provide a slide over whichthe machine may be conveniently and'readily Linloadedjupon the bottom, or loaded back' onto the truck; Itwill alsobe noted that due to proper balancing of the parts,herein arising trom' the fact that the element 21 is located slightly in rear ofthe middle of the element 15;that element will rema'in i'n" this tiltedor sloping osition after the machine has passed'oii' of the same oruntil it is desired to re-loadthe machine upon the truck; During thislatter operation, it will be understood that the chain 13 is connectedtola point in advance of the then rearwardly moving machine. In thisinstance, if desired, the chain may b'e'first connected tothe teedmember abutment on the mai'chineguidiiig frame, herein to the chain fork28 formed on the m'embe r 21 the point of pull thus being located in'such a manner as to enable the machine t'o be drawn readily re 'rward upthe inclined element 15 and the same time tend to hold the part 15' inthe desired rigid relation relative to the frame 1 dining thetirststages of the machine movement onto and over the element 151 If desired,however, the chain 13 may be at once connected to the feed abutmentmember or chain fork 14 or may be connected to they chain fork 23 andthereafter connected to the chain fork 14', as circumstances requirealthough I consider the latter connection preferable in view of the factthat in certain forms of my invention the rear end of the machineguiding frame extends into the path of the flexible feeding memberconnected between the machine and the abutment or chain 14. Obviously,during the rearward movement of the machine, which would result fromthis anchoring of its vteed chain, and the feeding oi the machine alongthe chain, the machine will eventually pass onto the rear end of theelement 15 and in rear oi the pivot thereof and thereby cause the latterto rock about its pivot preferably very shortly after the shoe on themachine has engaged with the stop 19 on the element 15. Thus it will benoted that the machine automatically causes not only a rocking movementof the element in question, but a reciprocatory movement of the samerelative to the frame 1 until the parts assume the position shown inFig. 3, wherein the driving element 9 on the machine is in mesh with themember 8 on the truck and the truck is' ready for transport. In myimproved construction, itwill of course be understood thatduring theoperation of loading or unloading the machine from the truck, it isdesirable for the wheels ofthe truck to be held stationary. This resultmay be readily accomplished by the use of the usual controllingmechanism provided on the truck and herein shown to assum'e the form ofa combined clutch and brake mechanism 24 adapted to be controlled by.a'suitablesingle controlling lever 25; It will also be noted that ifdesired, for any reason, to eliminate this mechanism .or to use myinvention in connection with another type ott'ruck', the latter may bereadily fixed in position by other means, as, for instance, inserting asuitable block or chock 26 in front or in rear of its front wheels. Itwill also be evident that in the use of my invention wherein the element15 is preferably substantial-1y fiat on its surface, suitable guides 27'disposed angularly with respect to'the frame 1' and sloping toward themachine receiving portion thereof maybe provided on opposite sides ofthat frame so that when a machine is brought up over the element 15 atan angle it will he deflected by these guides into proper positionrelative to the element 15a1id the truck frame 1.

In the embodiment of my invention shown in 4, it will be noted that aconstruction of substantially the same description as that above setforth is shown, although in this instance it will be observed thatinstead of providing the chain fork 23 upon the element 21', a jack 28is inserted through the openingv between the' members 1'6 andat a pointslightly in rear of the member 21 and fixed in the mine bottom and theroof, the chain 13 of'the machine being passed over the forwardtransverse brace 16 and fixed lill) to the mine'bottom by this jack.Thus, it will be observed that, in the illustrative con struction shown,substantially the same results in the loading operation are obtainablewithout the provision of a separate or special chain forkupon the member21. In this construction, as in the preceding construction, obviously,if desired, the jack 28 may be taken down after the machine has advancedav certain distance over the element 15, and the chain 13 then connectedto the usual chain fork provided at the rear of the machine and notshown in this view.

As a result of my improved construction, it will be observed that anexceedingly simple and rugged construction is provided which is adaptedto permit loading and unloading of the mining machine with increased.facility, the mining machine automatically acting to disengage itselffrom the truck driving mechanism, move the front end ofthe guiding framenearer the face, and tilt the same into'an inclined position whereinitis supported on the front end of the wheeledtruck at a convenientangle to the bottom and in such aposition as to be balanced when themachine is moved oil of the same. Also it will be noted that thisposition is such as to permit ready return of the machine up the smoothincline provided, and certain lowering and rearward move- I ment of themachine and guiding frame when the former travels up ontothe'overhanging rear end of the latter and continues its rearwardmovement; -Attention is also directed tothe fact that the illustrativecon struction shown herein may'not only be very readily andcheaplymanufactured, but may be adaptedto use upon trucks of standardconstruction without material change, the

element 15 being adapted to cooperate with a front axle ofstandard'type. It will also be observed that by the utilization of amember such as the member 21,adapted to cooperate with the front axle,it is possible to provide a pivotal connection of such'width aseffectively to overcome any tendency of the truckel-em-ent 15 to swinglaterally rela tive to the truckwhen struck by a machine brought up atan odd angle, and that such a machine'is free to slide over the surfaceof the element 15'and be deflected into its proper position relative tothe truck frame 1 by the cooperating machine deflecting tion to includeall such modifications within the scope of the appended claims.

' hat I claim as new and desire to secure by Letters Patentis: I '1. Amining machine truck, and a tiltable machine guidingframe reciprocablethereon andwhen tilted supported thereon intermediate its ends, at apoint substantially spaced from each of the latter, said machine guidingframe when in the tilted positlon providing an inclined plane onto andup which a mining machine may slide duringloading of the latter on saidtruck.

2. Amining machine truck, and a tiltable machine guiding frame pivotallyconnect-able thereto substantially midway between the ends of said frameand movable reversely longitudinally on said truck, said machine guidingframe when in the tilted position providing an inclined plane onto andup which a mining machine may slide during loading of the latter on'saidtruck.

3. A mining machine truck, a tiltable machine guiding frame pivotallymounted thereon, and means for loading a mining machine onto said framewhen the latter is in tilted position comprising feed member abutmentson said frame and the rear end of said truck, I 4. A mining machinetruck, a tiltable machine guiding frame movable reversely longitudinallythereon, and means for loading a mining machine onto said frame when thelatter is in tilted position comprising feed member abutments on saidframe and the rear end ofsaid truck. I

5. In a mining machine truck, a wheeled frame having a front axle, and areciproca ble supplemental machine guiding member thereon pivotallyconnectable with said axle.

j6. In a mining machine truck, a wheeled framehaving a front axle, and areciprocable supplemental machine guiding member thereonv pivotallyconnectable with said axle as it is moved forward over, said frame."

7. In a mining machine truck, a wheeled frame having a front axle, and amachine guiding member disposed at an angle to said frame and pivotallyconnected to said axle and reciprocableon said frame.

8. In a mining machine truck, a wheeled frame having a front axle, and amachine guiding member disposed at an angle to said frame andpivotallyconnected to said axle and reciproeable by a machine loadedthereon. i 1 s l '9. In a mining machine truck, a wheeled guiding framehaving front and rear axles, and asupplemental guiding member thereonreciprocable between the limits of said axles apd'pivotally connectablewith one of the same. i v 1 10. In a mining machine truck, a wheeledguiding frame having front and rear axles, and a supplemental guidingmember there- Ill) on rseiprecabie between the limits (if said axles andpivotalli cerium-able- W'itli said front axle.

, 11. In a mining machine'truck,a Wheeled frame having-front and rearaxles, and a reciprocable guiding member thereon having a dependingpivot member engage'able with one of" said axles" after a limited rec-ipro cation relative to said frame.

121 In a"mining machinetruck, a Wheeled frame having its front axleatits front end; a supple'n'ient'al guidingmem'ber thereon reciproc'ableon saidff nine, and means for pivotally connecting said member with saidaxle after a limited reciprocation of said member.

. 13'. m a mining machine truck, a Wheeled frame" having itsi'ront axleat its front end, a supplemental guiding member thereon re c'iproc ableon said frame, and depending means for pivotally connecting said m'e'm'her with said axle after a limited reci es cation of said member; p

141 In a' mining machine truck, a wheeled frame having its front axle atits front end, a supplemental guiding member thereon reciprocableon saidframe, means operable after' a limited reciprocation of said member forpivotally connecting the saiiie With said axle, and means on said memberengageable With a load movable ther'eover.

15. In a mining machine truck, a Wheeled frame'having its front axle atits front end, a" supplemental giiiding member thereonr'eciprocable onsaid frame, means operable after a limited reciprocation of saidmemberfor pivotally connecting the same with said axle, and means on saidmember for connecting a feeding" element thereto;

16. In a mining machine'truck, a- Wheeled machine guiding frame having arelatively short front portion and angularly disposed coo 'aeratingguides, and a relatively movable supplemental guiding member thereon pivotally mounted at a. point between its ends and disposed in'slopingposition'rlative to the frame between said cooperating guides.

17. In a mining machine truck,- a Wheeled machine guiding frame having arelatively short front portion and" angularly disposed cooperatingguides, and a supplemental guiding member disposed in sloping positionbetween said cooperating guides and resting on said frame at a pointintermediate its ends.

18. In a mining machine truck, a Wheeled frame having front and rearaxles; a '00- operating guiding member pivotally connected With saidfrontaxle cand having an opening intermediate its ends, a load formingelement, and a flexible connection between the same and said cooperatingmember extending through said opening."

19 In a mining machine truck, a Wheeled frame having front and rearaxles, a coopermag" guiding" member pivdtally connected with said" nearaxle a nd having'an opening inten'ue'diate its ends, a self-feedingmining machine thereon,- a feedingmember therefor havingon'eendextendingfrom saidmachine through s'aid opening, and means for fixingsa'i d end. 7

20. In a'. mining machine truck, a wheeled frame, a" su plementalguiding" n'iember inclined relative thereto, a mining machinehavingaflexible feedin'g member, and means whereby as said machine'isloaded upon said guidingmember said flexible feeding mem beris utilizedto hold said guiding member in rigid relatioir with respect to saidframe;

21 In a miningmachine truck, a Wheeled machine guiding frame having.arelatively short front portion and angularl y disposed cooperatingguides, and a recipi'ocable guidingmeinber disposed in sloping positionbetweensaid'cooperating guidesand" resting on said frame at apointintermediate its ends.

22. In a mining machine truck, a Wheeled frame havingfront and rear axlemembers, means for holding saidframe station'ary', a cooperatingreciproc'able guiding member supported on said frame in retractedposition during transport; and means carried on said memberandcooperating With said front axle to form apivot thereon after alimited reciprocation of; said m'ember.-

c 23-. In a miningmachine truckga Wheeled frame h'avingfront and rearaxle members, means for holding-said frame stationary, a reciprocable'guiding member supported on said frame, means carried on said guidingmember, and cooperating with said front axle to form a pivot-, and meanscarried on said member and engageable with a load movable relativethereto.

24. In mining machine truck, a: Wheeled frame having front and rear axlemembers, means for holding said frame stationary, a supplementalguidingmember normally supported on said framenneans carried on said guidingmember and cooperating with" said front axle to form a pivot, meanscarried on said" member for engaging with a load movable relativethereto, and means on said member for attaching: a feeding memberthereto. a a

25, In a mining. machine truck, a" Wheeled machine guiding frame havinga relatively short front portion and angularly disposed cooperatingguides, a sup-ple 'nental substantiallyflat gui'ding. member disposed inslopingi position intermediate said cooperating guides and resting onsaid frame at a point intermediate its ends, and means whereby :u r. sad membermaybe tilted and reclprocated int transp t positiono'n' saidframe.

26. In a mining machine truck,- a Wheeled machine guiding; frame liavinga relatively short front portion anaaligul'arlydi posed cooperatingguides having a fixed relation to the wheeled frame, and a reciprocahlesupplemental guiding member thereon pivotally connectible thereto at apoint between its ends. and disposable in a sloping positionrelative tothe fran'ie'between said cooperating guides. v v

27. In a mining machine truck, a wheeled .truck having front and rearaXles, a. machine guiding member movable longitudinally relative theretoand tiltable about a transverse axis located at a point interme, diatethe ends of said guiding frame, said guiding frame being tiltable aftera limited longitudinal movement of said frame relative to. said truckframe, and means intermediatethe ends of said frame engageable with thefront axle of said truck. 1

28. In a. mining'machine truck, a wheeled 'truck'having front and rearaxles, a machine guiding member movable longitudinally rela- I tivethereto and tiltable about a transverse axis located at a" pointintermediate the ends of said guiding frame, said guiding frame beingtiltable after a limited longitudinal movement of said framerelative tosaid truck frame, and means pivotally connectable with the front axleofsaid truck.

29. In a mining machme truck, a wheeled truck, a machine guiding frameslidable longitudinallyrelative thereto, and means operable after aforward longitudinal movement of said guiding frame'to tilt thelatterinto inclined position at the front end of said truck with its frontend, engageable with the bottom, its intermediate portion supported onthe front end of said truck, and

its rear end projecting upward and -rear ward from its point of support.In a mining machine truck,a wheele truck, a machine guiding frameslidable longitudinally relative thereto, and means -including a pivotmember slidable longitudinally therewith operable after -a,;f0'rwardlongitudinal movement of said frame to tilt' the latter intoinclined-position at the front end of said truck withits front endsupported by the bottom, its intermediate portion supported by thefrontend of said gitudinally relative thereto,-truck wheel drivingmechanism on said truck including a member engageable by amining-machine on saidguiding frame, and means operable after a forwardlongitudinal ;movement ,of

saidguidingframe to tilt the latter into in clined position at the frontend of said truck with its front end engageable with the bot-j tom, itsintermediate portion supported on the front end of; said tr'uclgand itsrear end projecting upward and rearward from its pointof support.

32. The combination with a rigid upstanding wheeled truck frame, of amachine guidingframe carried thereon and slidable longitudinallyrelative thereto, and means whereby said guiding frameafter a forwardlongitudinal movement of the latter with a machine on said truck frameis moved into inclined position and held against further longitudinalmovement at the front end of said'truck frame with its front end sup-:ported by the bottom, its intermediateportion supported by thev frontend of said truck frame, and its rear end projecting a; sub'-'Sllillltlill distance upward and rearward front its point of supportonthe truck frame, said guiding frame when insuch lnchned positionPIOVl'dlllg an inclined plane onto, and

alongwhiclr a mining machine may slide during loading orunloadlngthereof.

38; The combination.v with a rigid upstanding wheeled truck frame, of amachine guiding frame thereon disposable in ahorlzon- .tal plane belowthe tops of the wheels thereof andpivotally supported for'tiltingmovement on the front endof said truck frame at a point substantiallymidwaybetween the 'endsof said guiding frame and in tilted positionhaving its front end supported by'the mine bottom andits rear endprojecting a substantial, distance upward and rearward from its point ofsupport on the truck, and a feed -.:memberj abutment on said "machineguiding frame. Y I j 34. The combination with a rigid upstanding wheeledtruck frame, of a machine guiding frame thereon disposable in ahorizontal plane below the tops of the wheels thereof and 'pivotallysupportedfortilting move- IUD ment on the front end of said truckframeat a point substantially midway betweenthe ends of said'guidingframe and in tilted position having its front-end supported bythe mine bottom and its rear end projecting a substantial distanceupward and rearward from'its point of support on the truck, and a feedmember abutment on said truck frame 35. The combination with rigidupstanding wheeled truck frame, of a machine guiding frame thereondisposable in a horizontal plane below the tops of thetwheels thereofand pivotallysupported for tilting fmove; ment; on. the front endof saidtruck frame at a point substantially mid-way between the ends of saidguidingframe and in tilted position: having its front end supported bythe mine bottom and its rear end projecting a substantialdistance'upward and rearward from its point of support on the truck, afeed member abutment on said machine guiding frame, and truck wheeldriving mechanism driven' by a mining machine on said guiding frame. 5

36. The combination with a rigid upstanding wheel-ed truck frame, of amachine guid= ing frame thereon disposable in ahorizontal plane; belowthe tops" of-the 'wheels thereof and pivotally supported for tiltingmove ,ment on the front endofsaid= truck frame at a point substantially,mid-way between the ends of said" guiding frame: and in tilted positionhaving its front' end supported by the minebottom and its rear endprojeoting a substantialdistanc'e upward and-rearward from-its pointof-support-on-the truck, a feed member" abutment on-:said machine guidinframe; a: feed Zmember' abutment .on

said truck frame", and truck" wheel drivingmechanism dri-ven' by aminingmachine on saidguiding-frame: 1 i

37. The combination with rigid upstande in g :truck frame, of :amachine-guidin g frame said guiding ham-e a feed member abutment carriedby 'said guiding-frame; and: a truck wheel driving :member on: said:truck :frame rotatable by a. mining machine on said frame.

.38[ The combination witha rigid :upstanding truck frame; ofa'=machineguiding-frame pivotally supported for tilting anovement on thefront end of said truck frameat-apoint substantially; midway:- between;the ends. of

said a guiding frame and tilted position having itsfr-ont endsupportedbyathe minebottom and-its rear 'endr'projec'ting' a substantialdistance upward and rearward from its -point ofsupport on the truck.afeed member abutment; on said i truck framein rear of saidguidingdrame; means". formingfa feed member abutment intermediate theends of said-guiding frame; and a truck-zwheeldrivingmember} .onsaidttruck :fr-ame rotate frame.-- w I f 89. "The: combination with-arigidxup'stand ing truck frame, of a machine guiding frame pivotallysupported for: tilting movement 1 on able by amining machine on said;guiding th'e'front end of said truck frameataa point substantiallymidway between the ends of said;;guiding* frame and inutiltedi positionhaving its frontend supportednby: the mine bottom and its-rear endprojectingfa substan tial distance upward and rearward: from :its pointof support on the truck a. feed member abutment-on said truck frameinrear'nf said guidingframe ,'a feed member abutment carried by saidguiding frame, "-and' truck wheel driving lmechanism: on therear end ofi said truck frame including a member meshing with a moving part ofiamining machine on said guiding frame.-

40: Thecombination with a rigidupstandin g! wheeled; truck frame; havingan element thereomaof a tiltable machine guiding frame reciprocablymounted thereon, said machine guilding frame when-in-tilted positionproviding an inclined plane onto and up which a mining machine may slideduring load. ing of the latter onthe-truck and havinganelemen'ti'ithereon:engageable; with said. element: OlllSElltl truckframe-when said guiding;- frame is. in a predetermined position, saidelements. when in. engaged relation. pere mitting tilting 'movement ofthe guiding frame'irelative toithe truck-frame by gravity as the miningmachine is unloaded therefI'OHl/w it i 1. .7 1i.

41. The combinatio rwithn rigidupsta'ndinguWllGGlQCl truck frame havingan 1 1abutment thereon of a tiltablemachine guidingframereciprocablymounted on said truck frameysaid smaohine: guidingframe when in tilted position. providing an; inclined plane onto:andwupwhicha mining maehine m'ayslide. during loading of the latteronthe truckand having an abutment thereon en gageablerwithasaidabutment'on said truck frame for 1 limiting movement thereof 'relativetomsaid truck framedunno-direction said: abutments when engagedpermitting tilting movement lof'said: guiding frame relative to saidtruck-frame by gr avity as-fthe miningmmachine is unloaded therefrom:-

42. The combination: with a rigid upstand ingi wheeled truck framehaving longitudinalz'guides and an abutment thereon,---of a' tilta'bleinachi-ne guiding frame reoiprooably mounted on the guides on said; truckframe and when in tilted position provid-ingan inclined plane onto andup which a mining machine may slide du'ringeloading ;of-th'e latter onsaid-truck; and a depending-abut ment-on said guiding frame 7 engageablewith: said abutment on said truck frame for limiting form-1rd movementthereof relative .tosaid truck frame', said abutment's cooperating toform a fulcrum to permit tilting of .said guidin'g frame --r'ela'tive*t0saidtruck frame by gravity-as the mining machine is unloaded" therefromnThe combination with a rigid upstand ing wheeled truck framehavinganabutment thereon of a tiltable-inachine guiding framereciprocably mounted on said truck frame" and when in tilted positionprovi dingi.airinelin-edplane onto andup which a mining machine mayslide during. loading of the latter on the truelnsaid machine guidingframe having'an abutment thereon engageable with said-abutment ,on saidtruck 1 frame: for limiting movement thereof melative to asaid: truckframe in." one direction, said; abutments whenengaged "permittingtilting movement of sai d guiding framere' lative to -said truck--frame-'by-*gravity as the miningmachine is unloaded therefrom, and

a feed member abutment on said truck frame in rear of said guidingframe.

44, The combination with a rigid upstanding Wheeled truck frame havingan abutment thereon, of a tiltable machine guiding frame reciprocablymounted on said truck frame and when in tilted position providing aninclined plane'onto and up Which a mining machine may slide duringloading of the latter on said truck, said machine guiding frame havingan abutment thereon engageable With said abutment on said truck framefor limiting movement thereof relative to said truck frame in onedirection, said abutments when engaged permitting tilting movement ofsaid guiding frame relative to said truck frame by gravity as the'miningmachine is unloaded therefrom, a feed member abutment on said truckframe in rear of said guiding frame, and a truck Wheel driving member onsaid truck frame rotatable by the lmining machine on said guiding frame.

In testimony whereof I affix my signature.

CHARLES B. OFFICER.

